Groove-cutting tool



1.1-. LEWIS.

. -G'RO0VE punme TOOL. APPLICATION FILED IULY 18,1919.

1,352,522. PatentedSept. 14,1920.

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' wlmssfs A TTORIIE Y8 UNE'EEED STATES PATENT OFFICE.

GROOVE-CUTTING TOOL.

I Application filed July 18, 1919.

To all whom it may concern:

Be it known that I, JAMES ALFRED Lnwrs, a citizen of the United States, residing at Hartford City, county of Blackford and State of Indiana, have invented new and useful Improvements in Groove-Cutting Tools, of which the following is a specification.

This invention relates to tools, particularly to cutting tools, and has for its object the provision of a tool adapted for rotary engagement within. a piston ring groove of a piston and carrying a cutting blade whereby upon rotation of the tool upon the piston an oil groove will be cut, the particular advantage of this device being that it eliminates the necessity of placing the piston in a lathe to effect the cutting of the oil groove.

An important and more specific object is the provision of a tool of this character formed as a spanner body adapted for engagement within a ring groove and carrying a guide member within which is disposed a cutting blade projectable by means of an adjusting screw engaging thereagainst whereby oil grooves of varying depths may be formed.

An additional object is the provision of a device of this character which will be simple and inexpensive in manufacture, highly efficient in use, durable in service, and a general improvement in the art.

With the above and other objects and advantages in view, the invention consists in the details of construction to be hereinafter more fully described and claimed and illus trated in the accompanying drawing in which- Figure l is a longitudinal sectional view through a portion of an engine piston showin my tool in position.

Fig. 2 is a plan view of my tool.

Fig. 3 is a longitudinal sectional view through the cutting tool and the associated parts, this section being indicated by the line 3-3 of Fig. 4:, and

Fig. 4 is a cross sectional view on the line 4-4: of Fig. 3.

Referring more particularly to the drawings, the letter A designates an engine piston having the usual ring grooves B and also having the inclined passages C leading from the inner to the outer periphery of the piston. In pistons of this character it is a common practice to provide an oil groove in the Specification of Letters Patent.

Patented Sept. 14, 1920. Serial No. 311,776.

outer periphery communicating with the inclined passages C. Under the present system these grooves are out while the piston I is in a lathe.

In carrying out my invention I provide a tool comprising a body 10 formed of comparatively fiat material and formed in spanner shape, one end 11 being elongated to provide a handle. This body is engageable Within a ring groove B whereby the ring groove will serve as a guide.

Formed preferably integrally upon the other end 12 of the body lO is a guide sleeve 13having a rectangular bore 14 extending through a portion thereof and having a threaded cylindrical bore 15 extending through the remainder thereof. A cutting blade 16 is slidably mounted within the bore 1 1 and has a cutting edge 17 of the same contour as the desired cross sectional configuration of the oil groove to be out. A screw 18 is threaded into the bore 15 and engages against the blade 16 and this screw is provided with a finger engaging end 19 whereby it may be conveniently turned for projecting the blade beyond its guide sleeve as the cutting operation progresses.

In the use of the tool it will be seen that the body thereof is engaged within the proper ring groove B and the screw 18 is turned to bring the cutting edge 17 of the blade into engagement with the piston. The operator grasps the lever end 11 of the tool and moves the entire device about the piston and as this rotary movement is continued the operator turns the screw 18 more and more so that the cutting edge of the blade will be continually projected into the material of the piston as the groove is cut. After this operation is continued for an appreciable length of time it will be apparent that a groove 20 will be formed in the piston immediately adjacent the ring groove within which the tool is engaged.

From the foregoing description and a study of the drawing it will be apparent that I have thus provided a simple device by means of which an oil groove may be formed in an engine piston without the use of a lathe and without the complications involved in such use.

While I have shown and described the preferred embodiment of my invention it is of course to be understood that I reserve the right to make such changes in the form,

construction and arrangement of parts as will not depart from the spirit t is invention or the scope of the subjolned claim.

Having thus described my invention, I claim A tool of the character described comprising a body formed in spanner shape and having one end elongated to constitute a lever handle, said bodybeing adapted for engagement Within the piston ring receiving groove of a piston, an enlargement formed on one side oi said body at its other end and terminating short of the inner Wall vith a threaded bore leading into the opening, a blade slidable Within the angular portion of said bore and adapted to be disposed in engagement with the periphery of a piston, and a screw threaded into the bore and engaging the blade for adjusting the position thereof.

JAMES ALFRED LEWIS. 

